PSLE Linda saved $540 in November. This amount was a 10% decrease from what she saved in October. The amount she saved in December was a 40% increase from what she saved in November.
- What was the total amount that Linda saved from October to December?
- What was the percentage increase in the amount Linda saved in December compared to October?
|
Savings |
October |
100% |
|
Change |
- 10% |
|
November |
90% |
100 u |
Change |
|
+ 40 u |
December |
|
140 u |
(a)
Savings in October = 100%
Savings in November = 100% - 10% = 90%
90% = 540
1% = 540 ÷ 90 = 6
Savings in October
= 100%
= 100 x 6
= $600
Savings in November = 100 u
Savings in December = 100 u + 40 u = 140 u
100 u = 540
1 u = 540 ÷ 100 = 5.4
Savings in December
= 140 u
= 140 x 5.4
= $756
Total savings from October to December
= 600 + 540 + 756
= $1896
(b)
Increase in savings in December compared to October
= 756 - 600
= $156
Percentage increase
=
Increase in savingsSavings in October x 100%
=
156600 x 100%
= 26%
Answer(s): (a) $1896; (b) 26%